Submission #634110

#	Time	Username	Problem	Language	Result	Execution time	Memory
634110		Utaha	Catfish Farm (IOI22_fish)	C++17	0 / 100	48 ms	8096 KiB

fish

#include "fish.h"

#include <bits/stdc++.h>
using namespace std;

int n_col;
long long dp[305][3][305];
vector<vector<long long>> grid;
vector<vector<long long>> prefix;
const long long INF = 1e18;
const int UP = 0;
const int DOWN = 1;
const int STOP = 2;

long long max_weights(int N, int M, std::vector<int> X, std::vector<int> Y,
                      std::vector<int> W) {
    assert(N <= 300);
    n_col = N + 2;

    for(int i = 0; i < N + 2; i++) {
        grid.push_back(vector<long long>(N, 0));      
        prefix.push_back(vector<long long>(N + 1, 0));
    }

    for(int i = 0; i < M; i++) {
        grid[X[i] + 1][Y[i]] = W[i];
    }
    for(int i = 0; i < n_col; i++) {
        prefix[i][0] = 0;
        for(int j = 0; j < int(grid[i].size()); j++) {
            prefix[i][j + 1] = prefix[i][j] + grid[i][j];
        }
    }



    for(int i = 0; i < N + 2; i++) {
        for(int j = 0; j < 3; j++) {
            for(int k = 0; k <= N; k++) {
                // printf("%d %d %d %lld\n", i, j, k, dp[i][j][k]);
                if (i == 0) {
                    if (j != UP) {
                        dp[i][j][k] = -INF;
                    }
                    else {
                        dp[i][j][k] = prefix[0][k];
                    }
                }
                if (i == N + 1) break;

                if (j == UP) {
                    for(int t = k; t <= N; t++) {
                        dp[i + 1][UP][t] = max(dp[i + 1][UP][t], dp[i][j][k] + prefix[i + 1][t] - prefix[i + 1][k]);
                        // printf("DEBUG: %d %d %lld\n",i, t, dp[i + 1][UP][t]);
                    }
                    dp[i + 1][STOP][k] = max(dp[i + 1][STOP][k], dp[i][j][k]);
                }
                else if(j == STOP) {
                    for(int t = 0; t <= k; t++){
                        dp[i + 1][DOWN][t] = max(dp[i + 1][DOWN][t], dp[i][j][k] + prefix[i + 1][k] - prefix[i + 1][t]);
                    }
                }
                else{
                    for(int t = 0; t <= k; t++) {
                        dp[i + 1][DOWN][t] = max(dp[i + 1][DOWN][t], dp[i][j][k] + prefix[i + 1][k] - prefix[i + 1][t]);
                    }
                    // down and immediately up
                    for(int t = 0; t <= N; t++) {
                        const int height = max(t, k);

                        // printf("check: %d %d %lld % lld\n",i, t, dp[i][j][k], prefix[i + 1][height]);
                        dp[i + 1][UP][t] = max(dp[i + 1][UP][t], dp[i][j][k] + prefix[i + 1][height]);
                        // printf("DEBU2: %d %d %lld\n",i, t, dp[i + 1][UP][t]);
                    }
                }
            }
        }
    }
    return dp[n_col - 1][DOWN][0];
}

• Subtask 1: 0 / 3
• Subtask 2: 0 / 6
• Subtask 3: 0 / 9
• Subtask 4: 0 / 14
• Subtask 5: 0 / 21
• Subtask 6: 0 / 17
• Subtask 7: 0 / 14
• Subtask 8: 0 / 16